#include <wiringPi.h>
#include <stdio.h>
 
#define LaserPin    0
 
int main(void)
{
    if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
        printf("setup wiringPi failed !");
        return 1; 
    }
    //printf("linker LedPin : GPIO %d(wiringPi pin)\n",LedPin); //when initialize wiring successfully,print message to screen
 
    pinMode(LaserPin, OUTPUT);
 
    while(1){
        digitalWrite(LaserPin, HIGH);
        delay(500);
        digitalWrite(LaserPin, LOW);
        delay(500);
    }
 
    return 0;
}